Chair having an adjustable seat and back rest



Fil ed Feb. 19, 1951 v 2 SHEETS-SHEET 1 Feb. 10, 1953 G. MCSTAY JACKSON2,627,898

CHAIR HAVING AN ADJUSTABLE SEAT AND BACK REST IN VEN TOR.

few e Jftay fink! BY %e Kw F b, 10, 1953 s. MGSTAY JACKSON CHAIR HAVINGAN ADJUSTABLE SEAT AND BACK REST 2 SHEETSSHEET 2 Filed Feb. 19 1951 u wT Patented Feb. 10, 1953 CHAIR HAVING AN ADJUSTABLE SEAT AND BACK RESTGeorge McStay J ackson, Chicago, 111. Application February 19, 1951,Serial No. 211,714

This invention relates to certain new and useful improvements in a chairhaving an adjust- 3 Claims. (Cl. 155-116) able seat and back rest inwhich the seat and by the person sitting in the chair, to positionswhichwill be most comfortable.

Yet another and equally important object of T the invention is theprovision of an arrangement for accomplishing the foregoing objects,which will be economical in manufacture.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of partsto be hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings showing the preferred form of construction, and in which:

Fig. 1 is a side elevational view of the chair embodying my invention;

Fig. 2 is a side elevational view similar to Fig.

1, but showing the parts thereof in different positions;

Fig. 3 is a perspective exploded view of the several parts comprising myimproved chair;

Fig. 4 is a sectional detail view taken substantially on line 44 of Fig.5;

Fig. 5 is a front view of the chair;

Fig. 6 is a sectional detail view taken on line 5-6 of Fig. 5.

The preferred form of construction of my improved chair is illustratedin the drawings. this connection, my improved chair comprises astructure including side frames 10 arranged in parallel spaced relationand interconnected together by a structure Iii comprising front and rearcrossbars II and I2. A back rest M of suitable construction is pivotallyconnected as at IE to the frames 10.

The chair further includes a seat IB of suitable construction includinga seat cushion l1 and a 5' bottom plate 18. The back rest 14 likewiseincludes a cushion I9 and a back plate 20. These cushions may be of anyapproved construction which will afford the maximum comfort to the userof the chair.

Extending between the crossbars II and I2, and in parallel spacedrelation with respect to each other, are mounting bars 2|. Secured tothe bottom of the seat It in any suitable'gmanner and mounted in spacedrelation with respect to each other, are two horizontal seat supportingbars 22 and 22. These supporting bars have in their bottom portions apair of corresponding U-shaped grooves 23 and 23', which are adapted toreceive the mounting bars 2 I, These channelshaped grooves 23 and 23'are of such a depth that ball bearings 25. may be inserted in thechannels so as to ride upon the top of the mounting bars 2|, and stillform a flush surface with the bottom of the bars, as shown in Fig. 6.

The seat supporting bars 22 and 22' with their corresponding ballbearings 25 in the channelshaped grooves 23 and 23 are secured to themounting bars 2! by means of securing plates 25.

After the seat It with its horizontal bars 22 and 22' secured to thebottom thereof, is placed upon the mounting bars 2 I, the plate 25 isplaced across the bottom and in parallel relation with the supportingbars 22 and 22', and secured thereto in any suitable manner, thusproviding the seat I6 with movable connection to the frame H] of thechair. 1 g

The mounting bars 2| have coil springs 25 threaded on their forward end,such that the spring will engage the front crossbar l2 and the forwardseat supporting bar 22, to yieldably hold under the normal tension ofthe spring, the seat in normal position with respect to the frame 19.Also located in the mounting bars 2|, but near the rear crossbar II, isa stop pin 21, which is adapted to engage the rear seat supporting bar22 to prevent further movement of the seat in a rearward direction.

Secured to the back plate 20 as at 28 is one end portion of a dependingarm 29. The free end portion of this arm 29 has at its lower end anelongated slot 30 formed therein. This slot 3!! is adapted to receive ascrew 3| threaded into the seat [6 as at 32, and disposed between thescrew head 33 and the arm 29 is a coil spring 34. By this arrangement,when the seat is forced forward, the back will pivot on the connectionsI5, and the arm 29 will move against the action of the spring 34, asshown in Fig. 2.

The arrangement is such that a person sitting on the seat IS with hisbackagainst the back rest l4, may adjust the back rest l4 and the seatIE to such positions as will be most comfortable to him. This isaccomplished by simultaneously adjusting the back rest l4 and seat l6relative to the frames I 0 by bearing the body against the seat I6 andback rest M in the direction in which the occupant desires to move them,so as to arrange them in a position best suited to his comfort.

When the Weight of the occupant is removed from the seat l6 and the backrest M, the springs 26 are of sufiicient strength to cause these partsto assume their normal initial position, such as shown in Fig. 1.

My improved chair has many uses. It may be used for home purposes, inofiices, theaters, and many other places. relatively few parts and ishighly economica1 both in manufacture and use.

While I have illustrated and described this preferred form ofconstruction for carrying my invention into eifect, this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims.

Having thus described my invention, what I claim as new and desire toprotect by Letters Patent is:

1. An article of furniture comprising a structure including a pair ofinterconnected parallelly arranged side frames, a back rest arrangedbetween said frames, means pivotally connecting the back rest to saidframes for pivotal movement relative to said frames by the weight of abody thereagainst, a seat arranged between the frames below andforwardly of the back rest, means pro viding a slidable connectionbetween the seat and said structure whereby said seat may move inwardlyand outwardly relative to said frames, said last named means comprisinga pair of seat supporting bars having U-shaped grooves, roller membersmovable in said grooves and engaging an element of said structure, saidbars having connection with the seat and slidable connection with saidelement of structure, spring means for resisting outward movement ofsaid seat, an arm fixed to and depending from said back rest, and meanspivotally connecting the free end of the arm to the back of said seat.

2. An article of furniture comprising a structure including a pair ofinterconnected parallelly arranged side frames, a pair of mounting barsdisposed between and parallel to said side frames, a back rest arrangedbetween said frames, means pivotally connecting the back rest to saidframes for pivotal movement relative to said frames by the weight of abody thereagainst, a seat arranged The construction comprises.

4 between the frames below and forwardly of the back rest, meansproviding slidable connection between the seat and said structurewhereby said seat may move outwardly relative to said frames, saidlast-named means comprising a pair of seat supporting bars havingU-shaped grooves, roller members movable in said grooves and engagingsaid mounting bars, said seat supporting bars having connection with theseat and slidable connection with said mounting bars, spring means forresisting outward movement of said seat, stop means on said mountingbars to retain said seat in normal position as against said springaction, and a connection between the back rest and the seat whereby saidseat will be moved against the action of said spring means by pivotalmovement of the back rest relative to the frames by the weight of saidbody thereagainst.

3. An article of furniture comprising a structure including a pair ofinterconnected parallelly arranged side frames, a pair of mounting barsdisposed between and parallel to said frames, 2. back rest arrangedbetween said frames, means pivotally connecting the back rest to saidframes, a seat arranged between the frames and forwardly of the backrest, means providing slidable connection between the seat and saidstructure, said last-named means comprising seat supporting barsconnected to the seat in spaced parallel relation with respect to eachother and substantially at right angles with respect to the mountingbars, said seat supporting bars having grooves formed therein and saidmounting bars engaging in said grooves, spring elements embracing themounting bars and disposed thereon between one of said seat supportingbars and an element of said structure, an arm fixed to and dependingfrom said back rest, and means pivotally connecting the free end of thearm to the back of said seat.

GEORGE McSTAY JACKSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 677,234 Kelly June 25, 19012,374,848 Wohlk May 1, 1945 FOREIGN PATENTS Number Country Date 414,464Great Britain Aug. 9, 1934;

